Many people are curious about eyebrow tattoo and eyebrow tattooing. This is actually a cosmetic procedure in which the ink is being injected into the eyebrow lines of the person to permanently darken or fill in the already existing eyebrows. Sometimes an eyebrow tattoo is administered if the client wanted to achieve an eyebrow with a fuller look. Those who have not eyebrows or those who want to achieve a noticeable one are often the people who undergo eyebrows tattoo. Lesser eyebrows are often caused by over tweezing or an illness that leads to hair fallout..